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20=-w/2+16
We move all terms to the left:
20-(-w/2+16)=0
We get rid of parentheses
w/2-16+20=0
We multiply all the terms by the denominator
w-16*2+20*2=0
We add all the numbers together, and all the variables
w+8=0
We move all terms containing w to the left, all other terms to the right
w=-8
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